Relief-valve for engine-cylinders



PEL-L. RELIEF VALVE FOR ENGINE CYLINDERS. No. 357,191.

Patented Feb. 8, 1887.

iinesses UNITED STATES THOMAS M. FELL, OF TENAFLYyN Elv JE RSEY.

PATENT Urn-Ion.

RELIEF-VALVE For: ENGINE-CYLINDERS.

SPECIPICATION forming part of Letters Patent No. 357,191, dated February'8, 1887.

Application tiled June 14, 1886. Serial No. ltl llzl. (X0 model.)

To all whom it may concern.-

Be it known that I, THOMAS il/IARA FELL, of Tenafly, in the county ofBergen and State of New Jersey, have invented certain new and usefulImprovements in Automatic Relief- Valves for "Steam Engines; and I dohereby declare that the following is a full, clear, and exactdescription of the invention, which will enable others skilled in theart to which it appertains to make and use the same, reference being hadto the accompanying drawings, and to the letters of reference markedthereon, which form part of this specification.

This invention has relation tothe class of engine attachments known ascylinder relief-valves- It has forits object the automatic escape of"the water of condensation generally accumulating in the cylinders of theengines, and also the exhaust of any waste steam caused by the leakageof the piston or other cause.

The invention consists in the construction and arrangement of a cylinderwith attachments in which is placed a piston to which two rods areadjustably secured. These rods operate the valves that control theexit-ports, the said piston being operated by the initial pressure ofthe steam from the main cylinder, and also in other details ofconstruction, which will be more fully hereinafter described, andpointed out in the claims. v

Referring to the drawings, Figure l is a longitudinal section, and Fig.2 a cross-section, through one of the valves. Fig. 3 is a sectional View.in detail of another means of stopping the valves.

A is the cylinderfprovided with two openings, a a, to which pipes may beattached that will lead to each end of the main cylinder, the pipes andcylinder not being shown, as the operation of the device can beunderstood Without them. Opposite the openingsa a, aretheeXhaust-portsbb, andleading from these ports are pipes F for conductingto some convenient point the water of condensation and the ex hauststeam not regularly carried off.

Within the cylinder is the piston B, it being provided with grooves toform a water-packing for the same.

To each side of the piston is adj ustably secured the valve-rods G O,which project out through the headsH H of the cylinders. Stuffthem fromleaking.

ingboxes G G are formed in the heads, so. that the val ve-rods may bepacked to prevent The cylinder-heads H are of peculiar construction. Ontheir outer sides they are provided with the usual stuffing boxes, andon the inner sides with a cushioncylinder, or, in other words, with twochambers having a disk between them, only for different purposes. Thishead can be smoothly bored out without any trouble, and may be cast in asingle piece; also within the cylinders are the semi-cylindrical valvesD D to control the exhaiist-ports. These valves are provided with lugs d(1 upon their upper sides, between which the square portion of the rods0 O is inserted. This square portion I lie screwed upon the rod and heldin place by a jam-nut, or it may be made as apart of the rod. Thus thevalve is prevented from turning by the square portion. At one end of thesquare portion is formed by an enlargement pistons ii, and upon theinner side of the heads are formed cylinder-sff, into which the pistons'i loosely fit. The object of the piston and cylinders is to prevent thesolid blows that would otherwise be struck upon the heads of thecylinders, which would injure them, by forming an air or steam cushionfor the pistons. The saidcylinder confines the air to .a certain extent,so that when the pistons are moving rapidly the air or steam checks themomentum of the piston, and after the momentum is overcome the air orsteam gradually escapes between the sides of the cylinders and thepistons, allowing the piston to comp lete.its stroke.

The arrow in full line represents the live steam, and those in dottedlines exhaust-steam and water of condensation.

The operation is as follows: Steamhas entered the right-hand side of thecylinder and had moved the piston to theleft, thereby closing theexhaust-porton the steam side and opening the oneon the exhaust side,holding the valves in this position untilsteam from the main cylinderenters at a, when the valves are shifted and the exhaust takes placefrom the other port. The projecting valve-rodsin- .dicate whether thedevice is operating or not.

What I desire to claim, and secure by Letters Patent, is

1. In an automatic cylinder relief-valve, the

combination of the cylinder with the piston and the valves, the valvesand piston being Wholly contained within the cylinder, substantially asdescribed.

2. In an automatic cylinder relief-valve, the combination of thecylinder with the piston, the adjustable valve-rods attached thereto,and the valves, substantially as shown and described.

3. In an automatic cylinder reliefvalve, the combination of the cylinderwith the piston, the valves, the rod, and means for cushioning the same,substantially as shown and described.

4. 111 an automatic cylinder relief-valve, the combination of thecylinder with the piston, the valve, the valve-rod andcushioning-piston, and the cushioning-cylinder in the cylinder-head, asset forth.

5. In an automatic cylinder reliefvalve, the combination of the cylinderwith the piston, the valve, the valve-rods projecting from the cylinder,and the exhaust and inlet ports, as set forth.

6. In an automatic cylinder relief-valve, the

combination of the cylinder having the main 25 piston and adjustablepiston-rods, the cush- In testimony that I claim the foregoing as 5 myown I affix my signature in presence of two witnesses.

11108. M. FELL.

\Vitnesses:

O. DUFFY, F. R. HARDING.

